Comprehensive treatise of Hevansia and three new genera Jenniferia, Parahevansia and Polystromomyces on spiders in Cordycipitaceae from Thailand Author Mongkolsamrit, Suchada Plant Microbe Interaction Research Team, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120, Thailand suchada@biotec.or.th Author Noisripoom, Wasana Plant Microbe Interaction Research Team, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120, Thailand Author Tasanathai, Kanoksri Plant Microbe Interaction Research Team, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120, Thailand Author Kobmoo, Noppol https://orcid.org/0000-0002-3261-9970 Plant Microbe Interaction Research Team, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120, Thailand Author Thanakitpipattana, Donnaya Plant Microbe Interaction Research Team, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120, Thailand Author Khonsanit, Artit Plant Microbe Interaction Research Team, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120, Thailand Author Petcharad, Booppa Department of Biotechnology, Faculty of Science and Technology, Thammasat University, Pathum Thani, 12120, Thailand Author Sakolrak, Baramee Forest Entomology and Microbiology Research Group, Forest and Plant Conservation Research Office, 61 Department of National Parks, Wildlife and Plant Conservation, Phahonyothin Road, Chatuchak, Bangkok, 10900, Thailand Author Himaman, Winanda Forest Entomology and Microbiology Research Group, Forest and Plant Conservation Research Office, 61 Department of National Parks, Wildlife and Plant Conservation, Phahonyothin Road, Chatuchak, Bangkok, 10900, Thailand text MycoKeys 2022 2022-07-26 91 113 149 http://dx.doi.org/10.3897/mycokeys.91.83091 journal article http://dx.doi.org/10.3897/mycokeys.91.83091 1314-4049-91-113 CF7C54854F6A5FF9A1E51BB07889ED33 Polystromomyces Mongkolsamrit, Noisripoom, Sakolrak & Himaman gen. nov. Type species. Polystromomyces araneae Mongkolsamrit, Noisripoom, Sakolrak & Himaman. Etymology. From Latin "poly" (many), referring to many stromata of the fungus on the host. Description. Sexual morph: Stromata stipitate, multiple, pale yellow mycelium covering the host. Stipes arising from spider egg sac, cylindrical at the base, slightly enlarged midway to the terminal end of the stipe below the fertile head. Fertile heads produce at the terminal stipes, disc-shaped, upper surface slightly convex. Perithecia completely immersed, ovoid. Asci cylindrical. Ascospores hyaline, filiform, disarticulating into part-spores. Colony on PDA and OA, white, producing microcycle conidiation. Notes. Polystromomyces contains a new species, Po. araneae . It shares similarity with species in Hevansia in producing multiple stipes with fertile heads at the apex. This specimen is found on a spider egg sac ( Araneae ) attached to the underside of a dicot leaf. There is no record of the asexual morph on the specimen.